package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aopalliance.intercept.Joinpoint;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面类实现公共字段自动填充处理逻辑
@Slf4j
@Aspect
@Component
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")

    public  void autoFill(JoinPoint joinpoint) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        log.info("开始进行公共字段自动填充");
        //1.获取当前被拦截的数据库操作类型

        MethodSignature signature = (MethodSignature) joinpoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取到当前方法上的注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型
        //2.获取到当前被拦截的方法参数
        Object[] args = joinpoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0] ;
        //3.填充公共字段值
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据不同的操作类型进行赋值
        if (operationType == OperationType.INSERT){
            //为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射设置值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
               e.printStackTrace();
            }
        }else {
            Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            // 通过反射设置值
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }
    }
}
